Redox State Dependence of Single Molecule Conductivity
Journal of the American Chemical Society2003Vol. 125(50), pp. 15294–15295
Citations Over TimeTop 1% of 2003 papers
Wolfgang Haiss, Harm van Zalinge, Simon J. Higgins, Donald Bethell, Horst Höbenreich, David J. Schiffrin, Richard J. Nichols
Abstract
Spontaneous formation of stable molecular wires between a gold scanning tunneling microscopy (STM) tip and substrate is observed when the sample has a low coverage of alpha,omega-dithiol molecules and the tunneling resistance is made sufficiently small. Current-distance curves taken under these conditions exhibit characteristic current plateaux at large tip-substrate separations from which the conductivity of a single molecule can be obtained. The versatility of this technique is demonstrated using redox-active molecules under potential control, where substantial reversible conductivity changes from 0.5 to 2.8 nS were observed when the molecule was electrochemically switched from the oxidized to the reduced state.
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